Size box for sub?
#7
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Location: Denver, NC
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You are looking for the Thiele-Small (TS) parameters, and then match a box accordingly. A few tips: A ported box will give slightly higher output than a sealed box, a ported box is harder to tune correctly, a sealed box can be smaller and be EQ'ed to give better frequency response, the smaller the box-the higher the tuning frequency. Most driver websites will give suggest box size depending on your requirements. What driver do you have in mind?
#9
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Sealed design, go with no les than 1 cubic ft and no greater than 1.5 cf. Smaller box is tuned higher (around 45hz) more boom but less deep bass extension. Larger box is tuned around 38hz, little less output but deeper extension. You get the tradoffs. Either box should be stuffed.
Ported design, a little tougher to spec out but would be safe with 1.75cf to 2.25cf box. Port size should be tuned aound 33hz to 38hz. Hope this was helpful.
JL 500 amp is a good amp. I believe it also has an adjustable eg with frequency and slope adjustments.